Process for preparing compounds containing an ethionylamino group



United States 4 Claims. Cl. 260-458) This invention provides a process for preparing compounds containing an ethionylamino group or an N-alkylor N-phenyl-ethionylamino group which in'the form of their free acids correspond to the formula in which A stands for a substituted or unsubstituted aromatic radical and R for a hydrogen atom, a phenyl group or an alkyl group having 1 to 4 carbon atoms.

Ethionyl compounds of particular interest are those described by the formula Br Br wherein R is a member selected from the group consisting of hydrogen, phenyl, and lower alkyl, R; is a member selected from the group consisting of hydrogen, chlorine, nitro, hydroxy, di-(lower alkyl)-amino, phenyi azo, benzoyl, phenoxy, lower alkyl, and lower alkoxy, R is a member selected from the group'consisting of hydrogen, chlorine, nitro, lower alkyl, and lower alkoxy, R is a member selected from the group consisting of hydrogen and nitro, and, when R is hydrogen, R and R taken with the phenyl radical of the formula may be naphthyl.

We have found that the compounds'containing an I ethionylamino group or an N-alkylor N-phenyi-ethionylamino group can be prepared by reacting carbyl sulfate with a primary or secondary aromatic amine in nitrobenzene as reaction medium, mixing thoroughly the reaction mixture with water, neutralizing the aqueous phase by simultaneously adding an alkali-binding agent, separating the aqueous extract from the nitrobenzeue phase and recovering the resultant compound from the aqueous phase. This result-is surprising in so far as the ethionylamino group is not hydrolyzed by the action of water and alkali-binding agent.

By compounds containing anethionylamino group or an N-alkylor N-phenyl-ethionylamino group, there are to be understood those which in the form of the free acids correspond to the formula in which A stands for a substituted or unsubstituted aromatic radical and R represents a hydrogen atom, a phenyl group or an alkyl group having l to 4 carbon atoms. The aromatic radical can belong to the benzene, naphthalene, diphenyl, diphenyl ether, diphenyl thioether, diphenylmethane, benzophenone, diphenylamine, diphenylsulfone, azobenzene or stilbene series and may contain any substituent such as halogen atoms, alkyl, hydroxy, alkoxy, nitro or carboxylic acid groups.

-In carrying out the'process of the present invention such aromatic amines are preferred which are slightly soluble or insoluble in water. As primary or secondary aromatic amines serving'as starting material thege may be mentioned, for example, l-aminobenzene, l-mdth'ylaminobenzene, 4-nitro-l-aminobenzene, 4-nitro-1-methylamino- 3,264,340 Patented August 2, 1966 ice benzene, 4-nitro l butylaminobenzene, halogen-aminobenzenes such as 3-chloro-l-aminobenzene and 4-bromol-aminobenzene or halogen-nitro-aminobenzenes such as 3-chloro-4-nitro-l-aminobcnzene and 4-chloro-3-nitro-laminobenzene, furthermore toluidines, nitrotoluidines, aminophenols, aminophenol cthers or nitro-aminophenols such as 2-nitro-4-mcthyl-aminophenol. Furthermore, there may be used for the process of the present invention the amino or N-monoalkylamino derivatives of diphenylamine, diphenyl, diphenyl ether, diphenyl thioether, diphenylsulfone, stilbene, azobenzene, diphenylmethane, benzophenone and naphthalene which may contain any substituent named above.

For carrying out the process the primary or secondary aromatic amines are dissolved or suspended in nitrobenzene and mixed with pulverized carbyl sulfate or a solution of carbyl sulfate in nitrobenzene, while vigorously stirring and heating the mixture to a temperature between 0" and 100 0, preferably between 20 and C. The reaction products are recovered by thoroughly mixing the reaction mixture with wateratroom temperature, neutralizing the aqueousphase by simultaneously adding an acid-binding agent and separating the; aqueous extract, preferably at; elevatedtemperature from-the -nitro-benzene phase. If necessary, these jsteps are repeated. in order to extract the remainderlof the reaction product from the nitrobenzene phase. Thecompounds obtainable by the present invention are then isolated from the combined aqueous extracts, for example by salting out the resultant compound with an alkali chloride. After filtration the compounds are dried at low temperature.

As acid-binding agents, there may be used alkali metal or alkaline earth metal hydroxides, borates and phosphates, more particularly alkali metal or alkaline earth metal carbonates or hydrogen carbonates. such us potassium hydrogen carbonate, sodium carbonate or calcium carbonate.

The compounds obtainable by the process of the present invention are valuable intermediates for the production of medicaments, textile auxiliaries, pesticides and dyestuffs. For example. the nitro-substituted ethionylaminobenzenes obtainable by the present invention may be applied to cotton on which they may be fixed and reduced to the corresponding amino derivatives by treating them with sodium hydrosulfite in the presence of an alkaline substance. -When the amino compounds are diazotized on the fibre andcoupled with coupling components, there are obtained uniform dyeings having very good fastness properties.

The following examples serve to illustrate the invention but they are not intended to limit it thereto, the parts being by weight unless otherwise stated and the relationship of parts by weight to parts by volume being the same as that of the kilogram to the liter.

Example 1 from water. Into this solution 235 parts of crude carbyl sulfate (content of pure substance about 80%) are introduced, the batch is liquefied by heating to a temperature between 70 C. and 80 C. which temperature is maintained for about 2 hours. After cooling the viscous mass is repeatedly stirred with 3000 parts by volume of water and neutralized by simultaneously strewing in sodium hydrogen carbonate. The neutral extracts separated from the nitrobenzene phase at 80 to C. are combined and stirred for 15 minutes at 60 to 70 'C. with 10 parts each of kieselguhr and charcoal. After filtering and cooling the product is salted out from the solution obtained by adding potassium chloride and separated by filtration. After dissolving in water and recrystallizing of nitrobenzene. are added tli'opiyisewviihin one 1101111;

25 to 30 C. After. stirring the mixture for 15 hours at about 30C. water is added. The vnitrobenzene-water emulsion obtained=is neutralized by the addition of an N, 7.3; S, 16.8. 5 aqueous potassium hydrogen carbonate solution and, sub-- Example 2 sequently, heated to: 80 Ci At this temperature the 72 partsof 4 chloro w3 nitro Laminobenzene aqueous phase ;is separated, treated :Wtth charcoal, fil- ;roduced into 850 parts of nitrobenzene free from water f h compoufld 1s preclpltated and 117.5 parts of crude carbyl sulfate (content of pure by mtmducmg l chlondg" After" dlssolvmg. m substance about 80%) are added within 30 minutes. The water oandrrecrystilnlzmg Qrange W Crystals Chafing mixture is heated to a temperature between 70 and 75 at 231 aral'obtamed' v t C. which temperature is maintained fo'r'2 hours. After C14H14O6N3s2K-"'ca1u1medI i 5 cooling the mixture is repeatedly treated with water; and t ;H,-3.5;-S, 15.0.: neutralized by simultaneously adding solid sodium car- E m lefi f bonate. The neutral aqueous extracts are separatedat 15 425 f 3 90 C. from the nitrobenzene phase, combined and freed o mommy-0'1'ammobenzzne from traces of nitmbenzene by vacuum distillafion at troduced into 1440. parts of nitrobenzene free from water C. After cooling the compound is salted out by adding. and 235 parts of:crude carbyl sulfate (content of pure potassium chloride, filtered off and dried. After dis- SulDStaMlBabDPt 8.0%) are,added to 1?? 3 The solving in water and recrystallizing the potassium salt of fixture mallltamed at thls f lf for 3 1 99 the 4-chloro-3 riitr'o-l-N-ethionylaminobenzene is obtained Subs.equem1y"l1quefi?d;by-heanng to 7 9 After i in a very good yield ill-the formof weakly yellow needles cooling the mixture is ntroduced while stirring into 3000 melting at H2570 C. undfl decomposition parts of water neutralized by adding sodium carbonate C8H8@8N2S2C1K .CakmatedI C, 24.1; H, 20; and freed from the vnitrobenzene phase at 80 C.' The 7 3 3; 2 i treatment of the nitrobenzene phasenv'ith 'water and so-, Instead of S'Odium carbdnat'egthere may also be used diumlcarbonate is repeated until th:e ;water-solublei'com'-' i for lth'e neutralization magnesium oxide .or lithiumzcari lsi'cqmpleidy extracled" i?. bonate. extracts are combined, treated at 60? Wlii'l ltieselguh r' 3 p 1 Example 3 and charcoal, filtered .and .thelcompoun'd is saltedout L by adding potassium chloride-.; The crystal slutty- 6b- P t? 9 Z 's' m tainedis filtered, washed .with a potassiuinchloride'sol I methyl ethef,.i2:3 rts ofcrude carbyl sulfate content n and dried in vacud at 416 parts f a weakly of pure substanceabout: 7b) and 150 par s 0 llltfobenyellow powder. containing 352 parts of the potassium salt zene free from"water there are obtained according .to f 3 ch1oro 4 nim 1 N ethic,ny1aminpbmene are b.. P PF descrlbed j lf 1 P 1 Of Pu 35 tained. The compound ,is dissolved in water. :and ire-- P of 2'mn'o'5'Nethlonylammmhycgm" crystallizedinithe form of long needles melting .at 219 quinone dimethyl ether. The compound melts at 152 to to 0 under decomposition i C H O N S ClK.+-Calciilated: c, 24.1,;1-1, 2.0; Cl, 8.9.

C I-l O ,N S K.- Calculated: C, 28.3; H, 3.1; N, 6.6.. Found; C 240; 21; 1 9 0 Foundi 0 The following: table describes further. compounds! containing an ethionylamino group an N-alkylor NL-phcnyl- Example 4 ethionylamino group whicti'compounds have been pre-.' 39.4 parts of 4-amino-1,1'-azobenzene are introduced pared and isolated according 3 Process described in into l50 parts of nitrobenzene free from water. Into this Example 1 with the use of primary or secondary aromatic mixture 37.6 parts of carbyl sulfatedissolved in parts amines. The. yields obtained 'are good to very good.

Example Aromatic Amine Product Melting Point 6 3-nitr0-1-aniinobenzene 3-niti'o-1-N-ethionylziiuii.ioben- 220to 2'11? 0.

zone, potassium salt. 1 under decomposition. 7 3-nitro-1-methylamino 3-11itro-I-Nmethyl-Nethivnyl- 228-to .229? C.

benzene. timinorbenzene, potassium under decomsalt. position. 8-.. 4-nitro-l-ethylaminm 4-11ltl'O-I-N-OthYl7N-thi0l1yl- 182 to 184* .C.

benzene. amtino-benzene, potassium,

S 9 l-methylamino-benzene. l-N-methyLN-ethionylaminm 177'to178 C. benzene, potassium salt. 10 4-nlti'o l-butylamino- 4-nitro.t-N-butyl-N-ethionyL 1 172 to 173 C.

benzene. anligno-beiizene, potassium S3 11. 2,5-dimethyl-4-nitro-1- 2.5-6imetliyl-4-nit 'o-1-N=meth- 237 C. under I methyl-timintrbenyl -N-ethionylaminobenzene, I decomposizene. potassium salt. tion. 12 3-iiitro'4ethoxy-1-ami- 3-nitro-4-etlioxy-1-N-ethionyl- 208 to 209 C.

nobenzene; anlitino-beuzene, potassium S3 13 5-nitro-2,4-dimethoxy-1- B-nitro-2,4(liiiietlioxy-1-N- 194t-0195'C.

aminobenzene. etliionylnm inc-benzene,

potassium salt. 14; Z-nitro-Mnethylamino- Z-nitroA-N-methyl-N-etliionyl- 236 Grinder phenol. DilllIlODllOIlQl, monopotasdecomposisiuiu salt. tion. 15.. -N-lmetliylnmino- 4N-'iiietliyl-N-etliionyltimino- 217 to 218C.

phenol. pl enol, nioiiopottissiuni sult. 16. 2'N=metliylantino- 2-N-methyl-N-etliioiiyltiiiiino- 212 to 214 C.

naphthalene. naphthalene, potassium salt, under decom- IJOSI 1011. 17 Diplienylamine l-N-phonyl-N-etliionylainino- 205 0. under benzene, potassium stilt. decomposi- 10X). 18 3-diethyla1nino4-ami- 3'dietliylamino-l-N-ethionyl- 186 to 188C.

nobenzene. iiiniiiobenzcrie, potassium under decomstilt. position.

4-nn'imo'benzophenone" 4-N=etliioiiyliiniiiio-lieuzoplienone, sodium suit. 20 4-an1ino-diphenylethen. -N-ethionyliimiiio-tiiplienyl- 2l1to 213 C.

other, potassium salt.

, i 5 We claim: 1. A process for preparing ethionylamino compounds corresponding in the form of their free acids with the formula wherein R is a member selected from the group consisting I of hydrogen, phenyl, andlower alkyl, R is a member selected from the group consisting of hydrogen, chlorine,

nitro, hydroxy, di-(lower alky1)-amino, phenyl azo,

benzoyl, phenoxy, lower alkyl, and -lower'alkoxy, R is a member selected from the group consisting of hydrogen, chlorine, nitro, lower alkyl, and lower alkoxy,

wherein R, R R and R have the meanings given above, at a temperature between and 100 C., mixing the resultant reaction mixture at room temperature with water while neutralizing the aqueous phase by adding an acid binding agent selected from the group consisting of sodium carbonate, potassium carbonate, sodium hydrogen carbonate, potassium hydrogen carbonate, lithium carbonate, and magnesium oxide, whereby the corresponding metal salts of said ethionylamino compounds are formed in the aqueous phase, separating the aqueous phase from the nitrobenzene phase, and salting out the ethionylamino compound from the aqueous phase.

2. A process as claimed in claim 1, wherein the reaction in nitrobenzene is carried out at a temperature ranging from 20 to C.

3. The process for preparing the potassium salt of 4-nitrO-1- N-1nethyl-N-ethionyl-aminc-benzene, which comprises reacting carbyl sulfate in nitrobenzene with 4-nitro- 1-N-methyl-aminobenzene at a temperature between 0 and C., mixing the reaction mixture with water while neutralizing the aqueous phase by adding sodium hydrogen carbonate as acid-binding agent, separating the aqueous phase from the nitrobenzene phase, and salting out the ethionylamino compound from the aqueous phase by means of potassium chloride.

4. The process for preparing the potassium salt of 2- nitro 5 N-ethionylamino-hydroquinone-dimethyl-ether, which comprises reacting earbyl sulfate in nitrobenzene with Z-nitro-S-amino-hydroquinone dimethyl other at a temperature between 0 and 100 C., mixing the reaction mixture with water while neutralizing the aqueous phase by adding sodium hydrogen carbonate as acidbinding agent, separating the aqueous phase from the nitrobenzene phase, and salting out the ethionylamino compound from the aqueous phase by means of potassium chloride.

References Cited by the Examiner UNl'lliD SIAIES PATENTS 2,666,788 1/1954 Ebel 260--458 XR 2,682,509 6/1954 Ross 260-459 XR 3,163,667 12/1964 Klass etal 260-458 FOREIGN PATENTS 507,339 6/1939 Great Britain.

CHARLES B. PARKER, Prinmry Examiner.

JOSEPH P. BRUST, Emmi/ten FLOYD D. HIGEL. Assistant Examiner. 

1. A PROCESS FOR PREPARING ETHIONYLAMINO COMPOUNDS CORRESPONDING IN THE FORM OF THEIR FREE ACIDS WITH THE FORMULA 